Waterfall chart in d3.js inspired by this waterfall chart in Python
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December 27, 2015 00:29
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Waterfall Chart
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| (function () { | |
| var yScale = d3.scale.linear(); | |
| var waterfallData = []; | |
| var margin = 35; | |
| var width = parseInt(d3.select('body').style("width")) - margin - margin, | |
| height = parseInt(d3.select('body').style("height")) - margin - margin; | |
| var xs = [ | |
| {label: "Tomatoes", value: 50}, | |
| {label: "Potatoes", value: 30}, | |
| {label: "Gas", value: 90}, | |
| {label: "Correction", value: -50}, | |
| {label: "Unplanned", value: 9}, | |
| {label: "Stuff", value: 20}, | |
| {label: "Other Stuff", value: 20}, | |
| {label: "Foo", value: 10} | |
| ]; | |
| var data = []; | |
| var n = xs.length; | |
| var xDelta = width / n; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width + margin + margin) | |
| .attr("height", height + margin + margin) | |
| .append("g") | |
| .attr("transform", "translate(" + margin + "," + margin + ")"); | |
| // X-axis | |
| var x = d3.scale.ordinal() | |
| .rangeRoundBands([0, width], 0.05) | |
| .domain(xs.map(function (d) { | |
| return d.label; | |
| })); | |
| var xAxis = d3.svg.axis() | |
| .scale(x) | |
| .orient("bottom"); | |
| // Y-axis | |
| var y = d3.scale.linear() | |
| .range([height, 0]); | |
| var yAxis = d3.svg.axis() | |
| .scale(y) | |
| .ticks(4) | |
| .orient("left"); | |
| // Trend line | |
| var line = d3.svg.line() | |
| .x(function (d, i) { | |
| return i * xDelta + xDelta * .5 + margin / 2; | |
| }) | |
| .y(function (d) { | |
| return (d.value < 0) ? height - yScale(d.cumulativeSum - d.value) : height - yScale(d.cumulativeSum); | |
| }); | |
| calculateScale(); | |
| calculateBars(); | |
| addBarLabels(); | |
| makeAxisLines(); | |
| function numberWithCommas(x) { | |
| // Return the number formatted with commas | |
| return (x > 1000) ? x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",") : x.toString(); | |
| } | |
| function calculateScale() { | |
| // Calculate scale of the y-axis for drawing waterfall bars | |
| var max = 0, min = 0, cumSum = 0; | |
| xs.forEach(function (d) { | |
| cumSum += d.value; | |
| if (cumSum < min) { | |
| min = cumSum; | |
| } | |
| if (cumSum > max) { | |
| max = cumSum; | |
| } | |
| data.push({value: d.value, cumulativeSum: cumSum}); | |
| }); | |
| y.domain([min, max]); | |
| yScale.domain([min, max]).range([0, height]); | |
| } | |
| function calculateBars() { | |
| // Calculate and add rectangles to the chart | |
| svg.selectAll("rect") | |
| .data(data) | |
| .enter() | |
| .append("rect") | |
| .attr("class", function (d) { | |
| return (d.value < 0) ? "negative" : "positive"; | |
| }) | |
| .attr("x", function (d, i) { | |
| return i * xDelta + margin; | |
| }) | |
| .attr("y", function (d, i) { | |
| return (d.value < 0) ? height - yScale(d.cumulativeSum - d.value) : height - yScale(d.cumulativeSum); | |
| }) | |
| .attr("width", function (d) { | |
| return xDelta; | |
| }) | |
| .attr("height", function (d) { | |
| return yScale(Math.abs(d.value)); | |
| }); | |
| } | |
| function addBarLabels() { | |
| // Add labels to the rectangles | |
| var barLabels = svg.append("g") | |
| .selectAll('text') | |
| .data(data) | |
| .enter() | |
| .append("text") | |
| .attr("x", function (d, i) { | |
| return i * xDelta + xDelta * .5 + margin / 2; | |
| }) | |
| .attr("y", function (d, i) { | |
| return (d.value < 0) ? height - yScale(d.cumulativeSum) + 25 : height - yScale(d.cumulativeSum); | |
| }) | |
| .attr('dy', -5) | |
| .text(function (d) { | |
| return numberWithCommas(d.cumulativeSum.toFixed(0)); | |
| }); | |
| } | |
| function makeAxisLines() { | |
| // Draw x- and y- axis lines | |
| svg.append("g") | |
| .attr("class", "axis") | |
| .attr("transform", "translate(" + margin + "," + height + ")") | |
| .call(xAxis); | |
| svg.append("g") | |
| .attr("class", "axis") | |
| .call(yAxis); | |
| svg.append("path") | |
| .datum(data) | |
| .attr("class", "trend-line") | |
| .attr("d", line); | |
| } | |
| }) | |
| () |
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| <!doctype html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"/> | |
| <title>Waterfall Chart</title> | |
| <style> | |
| body, html { | |
| height: 100%; | |
| width: 95%; | |
| padding: 0; | |
| } | |
| body { | |
| background-image: url(logo4.png); | |
| background-repeat: no-repeat; | |
| background-position: 100% 100%; | |
| } | |
| .rect { | |
| border: solid 1px #ccc; | |
| font: 10px sans-serif; | |
| shape-rendering: crispEdges; | |
| } | |
| rect.positive { | |
| fill: rgb(8, 37, 131); | |
| } | |
| rect.negative { | |
| fill: rgb(255, 0, 0); | |
| } | |
| .trend-line { | |
| fill: none; | |
| stroke: rgb(0, 138, 0); | |
| stroke-width: 1.5px; | |
| stroke-dasharray: 10, 10; | |
| } | |
| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="chart"></div> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="d3.waterfall.js"></script> | |
| </body> | |
| </html> |
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